dockerfile for zeit now

Dockerfile

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+FROM mhart/alpine-node
+RUN apk add nodejs nodejs-npm
+RUN mkdir /peer-server
+WORKDIR /peer-server
+COPY package.json .
+COPY bin ./bin
+COPY lib ./lib
+COPY app.json .
+RUN npm install
+EXPOSE 9000
+CMD node bin/peerjs --port 9000